Kohaku has located the treasure left behind by Byakuya and the others, but it's encased in concrete. Senku has to devise a plan to quietly get at the contents inside, so as to not alert the guards.
And in it, drop by drop, we get 
the water from the miracle cave...
...وفيها، قطرة قطرة، نحصل على ماء الكهف المعجزة
das Wasser der Wunderhöhle:
es el agua de la cueva milagrosa,
es el agua de la cueva milagrosa,
C’est l’eau
de la caverne miraculeuse…
l'acqua della caverna miracolosa.
E dentro dele, gota a gota, conseguimos 
a água da caverna milagrosa...
та самая вода из пещеры чудес.